Geography and History

Ben's Guide to the U.S. Government for Kids
Teaches kids from kindergarten through 12th grade about the Federal Government

National Geographic Kids
Kid's version including stories about animals, geography, and more

Presidents of the United States by Internet Public Library
Background information, election results, cabinet members, notable events and other points of interest.

Whitehouse 101
Facts & Fun for all ages

The World Factbook by the CIA
Extensive data, maps, and flags of all the countries in the world.